P1610

P1610

Diagnosis information - CAN

Air-conditioning system regulator communication

Diagnostic conditions
The air-conditioning system regulator initially tests internal function sequences after wake-up. If they are OK, all diagnosable outputs are then tested and any faults are stored.
Air-conditioning system regulator wake-up through:

- Event-induced CAN message
- Ignition on

Possible fault causes
- No power supply for air-conditioning system regulator
- Air-conditioning system regulator incorrectly coded
- Short circuit or open circuit in the CAN comfort
- Air-conditioning system regulator faulty (in most cases the cause is not the air-conditioning system regulator but incorrect coding.)

Fault effects
- Communication via the CAN comfort is no longer possible.
- No other control units are able to communicate with the air-conditioning system regulator.

Affected contacts on air-conditioning system regulator
Connector [C]:
- 17 CAN comfort high
- 18 CAN comfort low

Connector [E]:
- 5 power supply - terminal 30
- 9 ground supply - terminal 31
- 10 ground supply - terminal 31